On February 9th, at 2:02 a.m. Hanoi time, a message appeared on Nguyen's Twitter account. "I am sorry 'Flappy Bird' users," it read. "22 hours from now, I will take 'Flappy Bird' down. I cannot take this anymore." The message was retweeted more than 145,000 times by the disbelieving masses. How could someone who hit the online jackpot suddenly pull the plug? But when the clock struck midnight the next evening, the story came to an end. Nguyen, as promised, took Flappy Bird offline. In his wake, he left millions of jilted gamers, and one big question: Who was this dude, and WTF had he done?

[On creating the game.]

"When you play game on a smartphone," he says, with an ever-present cigarette dangling from his lip, "the simplest way is just tapping." [...]

Like paddleball, he limited his game to just a couple of elements – the bird and the pipes – and resisted the usual urge to lard the action with new elements as the player progressed. He tuned the physics so that the bird was fighting gravity so strong, even the slightest wrong tap would kill it. Since the deaths would be so frequent, Nguyen wanted to make them entertaining. He tried having the bird explode in a bloody pulp, or bounce back across the ground, before settling on a faceplant. He then sifted through hundreds of sounds before settling on a kung-fu-style thwack to make the bird's demise even funnier. (The first question he asks me about the game is if it made me laugh.) "The bird is flying along peacefully," he says with a chuckle, "and all of a sudden you die!"

[On his newfound fame.]

"Seeing the game on top, I felt amazing," Nguyen recalls. Like everyone else, he was shocked by its meteoric rise – and the avalanche of money that would be wired into his bank account. Even with Apple and Google's 30 percent take, Nguyen estimated he was clearing $50,000 a day. Before long, Shuriken Block and a new game he had submitted called Super Ball Juggling joined Flappy Bird in the Top 10. But other than buying a new Mac, and taking his buddies out for rice wine and chicken hot pot, Nguyen wasn't much for indulging. "I couldn't be too happy," he says quietly. "I don't know why." Remarkably, he hadn't yet even bothered to tell his parents, with whom he lived. "My parents don't understand games," he explains.

As news hit of how much money Nguyen was making, his face appeared in the Vietnamese papers and on TV, which was how his mom and dad first learned their son had made the game. The local paparazzi soon besieged his parents' house, and he couldn't go out unnoticed. While this might seem a small price to pay for such fame and fortune, for Nguyen the attention felt suffocating. "It is something I never want," he tweeted. "Please give me peace."

But the hardest thing of all, he says, was something else entirely. He hands me his iPhone so that I can scroll through some messages he's saved. One is from a woman chastising him for "distracting the children of the world." Another laments that "13 kids at my school broke their phones because of your game, and they still play it cause it's addicting like crack." Nguyen tells me of e-mails from workers who had lost their jobs, a mother who had stopped talking to her kids. "At first I thought they were just joking," he says, "but I realize they really hurt themselves." Nguyen – who says he botched tests in high school because he was playing too much Counter-Strike – genuinely took them to heart.

By early February, the weight of everything – the scrutiny, the relentless criticism and accusations – felt crushing. He couldn't sleep, couldn't focus, didn't want to go outdoors. His parents, he says, "worried about my well-being." His tweets became darker and more cryptic. "I can call 'Flappy Bird' is a success of mine," read one. "But it also ruins my simple life. So now I hate it." He realized there was one thing to do: Pull the game. After tweeting that he was taking it down, 10 million people downloaded it in 22 hours. Then he hit a button, and Flappy Bird disappeared. When I ask him why he did it, he answers with the same conviction that led him to create the game. "I'm master of my own fate," he says. "Independent thinker."

[On taking the game down.]

Since taking Flappy Bird down, he says he's felt "relief. I can't go back to my life before, but I'm good now." As for the future of his flapper, he's still turning down offers to purchase the game. Nguyen refuses to compromise his independence. But will Flappy Bird ever fly again? "I'm considering it," Nguyen says. He's not working on a new version, but if he ever releases one it will come with a "warning," he says: "Please take a break."